#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
int main()
{
	int a = 0;
	while (scanf("%d", &a) != EOF)
	{
		for (int i = 1; i <= a; i++)
		{
			for (int j = 1; j <= a; j++)
			{
				if (i == 1 || i == a || j == 1 || j == a)
				{
					printf("* ");
				}
				else
				{
					printf("  ");
				}
			}
			printf("\n");
		}
	}
	return 0;
}